| 摘要 |
This device is characterised in that it comprises a succession of rods for raising the film 4, in the form of a downwardly open obtuse angle, comprising, starting from the point of articulation 5, first and second branches 4a, 4b which connect to the vertex of the obtuse angle and can pivot in relation to one another, each of these raising rods 4 being fastened to two common control cables 11 which extend all along the tunnel frame or the greenhouse, namely a first cable 11 fastened to the first branch 4a in the vicinity of the vertex of the obtuse angle, and a second cable fastened to the second branch 4b close to its free end which is fastened to a longitudinal shell supporting the plastic film. <IMAGE>
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